Charles o



Patented Feb. 13, 1894-.

n mun umocmmmo COMPANY.

G. 0. HEGGEM. PISTON HEAD FOR STEAM ENGINES.

.(No Model.)

. Uri'i'rn Snares arnnrr anion.

CHARLES O. HEGGEM, OF MASSILLON, OHIO, ASSIGNOR TO THE RUSSELL & COMPANY, OF SAME PLACE.

SPECIFICATION forming part of Letters Patent No. 514,621, dated February 13, 1894.

Application filed March 29, 1893. Serial No. 468,147. (No model.)

.To all whom it may concern.-

1 3e it known that I, CHARLES O. HEGGEM, a citizen of the United States, and a resident of ill'assillon, county of Stark, Stateof Ohio, have ,rivcnted a new and useful Improvement in "reference being drawings,

j piston heads for steam engines,

Piston-Heads for Steam-Engines, of which the following is a full, clear, and exact description, had to the accompanying making part of this specification.

My invention relates to an improvement in particularly for that class of engines adapted for high speed, the object of which is to provide a 2 light, strong and inexpansible head, the body portion of which is formed of a single piece of metal.

With these objects in view my invention cimsists of certain features of construction and combination of parts as hereinafter described (1 pointed out in the claims.

t Figure l, of the accompanying drawings is fa view in perspective of a piston head,illus- .trating my invention.

Fig. 2, is a transverse section through as :12, and Fig. 3, is a longitudinal section through a z.

Referring to Fig. 2, representing a transverse section of the head, which is made of cast metal, havinga central hub or sleeve B, sides C and rim D, that incloses an annular cell or open space E, divided at the hub and side portions by a series of braces F extending from the hub along the sides 0 to the rim D, as shown by the line a, see Fig. 2. The limit of the cells or spaces between the bracesis shown by the dotted lines 6. These parts are cast integral; the annular space E is cored out to lighten the head, and the braces F are provided to support the sides 0, and rim D.

About the rim D is provided an annular dove tail recess G, in which is cast an annular ring of anti-friction metal H, at the sides of which are provided small grooves c, in which is placed packing rings cl; but if preferred the rings (1 may be omitted and small grooves substituted, to form a water packing.

At one side of the head in the circular aperture J of the hub is provided a tapered portion e, adapted to a similar tapered portion of the piston rod K, at the other side of the head in the aperture J is provided a threaded portion f, adapted to a similar thread on the end portion of the piston rod,

As hereinafter stated the object of this invention is to provide a fixed or inexpansible head, the diameter of which has been deter mined at the factory and cannot be expanded by the operator.

The antifriction metal ring is carefully fitted to the inner face of the cylinder, the speed of the head is such that little if any steam can pass between the head and the cylinder during its movement in one way, and the frequent reversal of the movement, practically prevents such an escape or leakage of steam. The fixed conditions of the head effectually prevent an inexperienced operator from expanding the head, andthereby causing great friction between the head and cylinder and consequently a great loss of power.

To more securely hold the anti-friction ring in place and prevent it from bulging-at its middle, I provide short dove-tail ribs h so that when this ring is castin the groove G the metal will flow between the ribs which thereby serve as an additional means for securely fastening the ring in place. The ring is then ground down to conform to the interior diameter of the cylinder.

Having thus fully described the nature and object of my invention, what I claim, and desire to secure by Letters Patent, is

1. A piston head having a peripheral dovetail groove, a series of short dove-tail ribs projecting from the base of said groove and an anti-friction ring cast in said groove and covering said ribs, substantially as herein de- In testimony whereof I have hereunto set scribed.

my hand this 23d day of March, A. D. 1.893. 2. A piston head consisting of the hub B A 1 4M the sides 0, braces F rim D having a periph CHARLES HEGGE eral groove, an anti-friction ring cast in said Witnesses:

groove, and packing rings (1, substantially as JESSE W'. SMITH, herein described. 1

WM. A. HARRIS.

It is hereby certified that the assignee, The Russell 86 Company, in Letters Patent No. 514,621, granted February 13,1894, upon the application of Charles 0. Heggem, of

Massillon, Ohio, for an improvement in Piston-Heads for Steam-Engines, should have been described and specified as Russell if; 00., instead of The Russell 86 Company; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed, countersigned, and sealed this 27th day of February, A. D. 1894.

JNO. M. REYNOLDS, Assistant Secretary of the Interior,

[SEAL] Oountersigned JOHN S; SEYMOUR,

Omnnn'ssz'oner of Patents. 

